XML-based CSS

Hello,
Can somebody tell me why don't w3c provide us with xml-based css format?
It may be optional, but it would be easy to parse css using simple xml
parsers (we have such for every modern programming language).
Xml-based css will simplify development if:
- we need to generate css dynamically in php,asp,asp.net,perl, etc...
(converting style other document format, quering it from database or any
other source),
- we have CMS and wonts to add css editor to it,
- we wont parse css to print, convert or render document,
- we wont to store pictures (dackgrounds, etc...) inside stylesheet (xml
provides us such ability opposed to css),
etc.
Example:
<stylesheet>
  <style tag="body">
    <background><color>FFFFFF</color></background>
    <border><style>none</style></border>
    <color>797A7A</color>
    <font><family>Verdana,Arial,Helvetica,sans-serif</family><size>12px</
size></font>
    <text-align>center</text-align>
    <margin>0</margin>
    <padding>0</padding>
  </style>
  <style tag="a">
     <color>797A7A</color>
    <outline-style>none</outline-style>
   </style>
  <style class=".myclass">
     <color>BBBBBB</color>
  </style>
</stylesheet>